en
68
Installation
Indications,
functions and options
Messages
Commissioning
Operation and function
Stores cool down at night
Collector circuit pump runs during
the night?
no
yes
Check controller
Collector temperature at night is
higher than the outdoor temperature.
no
yes
Check the non-return valves in the
flow and the return pipe for func-
tional efficiency.
Sufficient store insulation?
yes
no
Increase insulation.
Insulation close enough to the store?
yes
no
Replace insulation or increase it.
Are the store connections insulated?
yes
no
Insulate the connections.
Warm water outflow upwards?
no
yes
Change connection and let the water
flow sidewards or through a siphon
(downwards); less store losses now?
Does the DHW circulation run for
a very long time?
no
yes
Use the circulation pump with timer
and switch-off thermostat (ener-
gy-efficient circulation).
Circulation pump and blocking valve
should be switched off for 1 night; less
store losses?
yes
no
Check whether the pumps of the
after-heating circuit run at night;
check whether the non-return valve
is defective; problem solved?
no
no
yes
o.k.
Check the non-return valve in warm
water circulation - o.k.
yes
no
Further pumps which are connect-
ed to the solar store must also be
checked.
The gravitation circulation in the
circulation line is too strong; insert a
stronger valve in the non-return valve
or an electrical 2-port valve behind
the circulation pump; the 2-port valve
is open when the pump is activated,
Clean or replace it.
otherwise it is closed; connect
pump and 2-port valve electrically in
parallel; activate the circulation again.
Deactivate pump speed control!
The solar circuit pump does not work, although the collector is considerably
warmer than the store
Is the display working?
yes
no
Does the pump start up in manual
operation?
yes
There is no current; check fuses / re-
place them and check power supply.
The adjusted temperature difference
for starting the pump is to high;
choose a value which makes more
sense.
no
Is the pump current enabled by the
controller?
yes
Is the pump stuck?
Turn the pump shaft using a screw-
driver; now passable?
Pump is defective - replace it.
Controller fuse ok?
Controller might be defective -
replace it.
no
yes
no
no
yes
Replace fuse
a
a
b
b
